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Superconducting TaC nanoparticle-containing ceramic nanocomposites thermally transformed from mixed Ta and aromatic molecule precursors

Published online by Cambridge University Press:  07 August 2017

Manoj Kolel-Veetil*
Affiliation:
Chemistry Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Catherine Walker
Affiliation:
Chemistry Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Joseph Prestigiacomo
Affiliation:
Materials Sciences Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Boris Dyatkin
Affiliation:
Chemistry Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Syed Qadri
Affiliation:
Materials Sciences Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Ramasis Goswami
Affiliation:
Materials Sciences Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Kenan Fears
Affiliation:
Chemistry Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Matthew Laskoski
Affiliation:
Chemistry Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Michael Osofsky
Affiliation:
Materials Sciences Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
Teddy Keller
Affiliation:
Chemistry Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

We report the structure and synthesis approach for obtaining a ceramic nanocomposite pellet comprising ∼50 nm-sized TaC nanoparticles. A mixture of Ta metal powder and the carbon precursor 1,2,4,5-tetraphenylethynyl benzene, pelletized by vacuum pressing at 131 MPa, on further thermal treatment with Ar at 1400 °C yields such a ceramic composite. On air oxidation, the TaC nanoparticles are converted to Ta2O5 nanoparticles at 760 °C. Hardness measurements revealed that the composite exhibited a global hardness in the range of 1.23–1.57 GPa. However, nanoindentation studies showed that, locally, hardness of the TaC nanoparticles (∼15 GPa) approached that of the densified TaC ceramic. Superconducting studies of the pellet consistently exhibited two transitions with T c values of 10 K and 8.5 K, respectively, that corresponded to bulk TaC and to a component of unknown origin. The results discuss the morphological and constitutional characterizations of the TaC nanoparticle-containing composite.

Type
Invited Articles
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

b)

National Research Council Postdoctoral Fellow.

Contributing Editor: Xiaowei Yin

References

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